Fabrication of circuits by multi-nozzle electrohydrodynamic inkjet printing for soft wearable electronics

Abstract Wearable electronic devices are evolving from current rigid configurations to flexible and ultimately stretchable structures. These emerging systems require soft circuits for connecting the various working units of overall system. This paper presents fabrication by electrohydrodynamic (EHD) inkjet-printing technique. Multi-nozzle EHD printing head is employed rapid electric on a wide set materials, including glass substrate (rigid), polyethylene terephthalate (PET) films, thermoplastic polyurethane (TPU) films. To avoid effects materials jettability, proposed multi-nozzle equipped with integrated individual counter electrodes (electrodes placed above substrate). High-resolution (50 ± 5 µm) high electrical conductivity (0.6 ? ? ?1 ) validate our well-controlled approach. The produced showed excellent flexibility (bending radius ? mm radius), stretchability (strain 100%), long-term mechanical stability (500 cycles at 30% strain). concept further demonstrated strain sensor based EHD-printed circuit, monitoring human motion (finger bending), indicating potential applications these in wearable devices. Graphic